（） are used to limit the pressure in any particular portion and mainly control the pressure after the valve.<br>A:Relief valves<br>B:Check valves<br>C:Safety valves<br>D:Reducing valve

（） are used to limit the pressure in any particular portion and mainly control the pressure after the valve.
A:Relief valves
B:Check valves
C:Safety valves
D:Reducing valve

出自：海船船员证

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